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参数资料
| 型号： | LM2682M/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 15 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, SOIC-8 |
| 文件页数： | 4/7页 |
| 文件大小： | 160K |
| 代理商： | LM2682M/NOPB |
Basic Application Circuits
Application Information
VOLTAGE DOUBLING INVERTER
The main application of the LM2682 is to generate a nega-
tive voltage that is twice the positive input voltage. This
circuit requires only three external capacitors and is con-
nected as shown in Figure 1. It is important to keep in mind
that the efficiency of the circuit is determined by the output
resistance. A derivation of the output resistance is shown
below:
R
OUT = 2(RSW1+RSW2+ESRC1+RSW3+RSW4+ESRC2)+
2(R
SW1+RSW2+ESRC1+RSW3+RSW4+ESRC2)+
1/(f
OSCxC1) + 1/(fOSCxC2) + ESRC3
Using the assumption that all four switches have the same
ON resistance our equation becomes:
R
OUT = 16RSW + 4ESRC1 + 4ESRC2 + ESRC3 +
1/(f
OSCxC1) + 1/(fOSCxC2)
Output resistance is typically 90
with an input voltage of
+5V, an operating temperature of 25C, and using low ESR
3.3 F capacitors. This equation shows the importance of
capacitor selection. Large value, low ESR capacitors will
reduce the output resistance significantly but will also require
a larger overall circuit. Smaller capacitors will take up less
space but can lower efficiency greatly if the ESR is large.
Also to be considered is that C1 must be rated at 6 VDC or
greater while C2 and C3 must be rated at 12 VDC or greater.
10099703
FIGURE 1. Doubling Voltage Inverter
10099704
FIGURE 2. +5V to 5V Regulated Voltage Converter
LM2682
www.national.com
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2682MX/NOPB | 功能描述:IC REG SWITCHD CAP DBL INV 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| LM2685B E WAF | 制造商:Texas Instruments 功能描述: |
| LM2685MTC | 制造商:Texas Instruments 功能描述:VOLT CONVERTER SMD 2685 TSSOP14 |
| LM2685MTC | 制造商:Texas Instruments 功能描述:VOLT CONVERTER SMD 2685 TSSOP14 |
| LM2685MTC/NOPB | 功能描述:IC REG MULTI CONFIG DL 14-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
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